The Collaborative International Dictionary
clitellus
clitellus \cli*tel"lus\ (kl[i^]*t[e^]l"l[u^]s), n. [NL., prob. fr. L. clitellae a packsadle.] (Zo["o]l.) A thickened glandular portion of the body of the adult earthworm, consisting of several united segments modified for reproductive purposes.
Wiktionary
clitellus
n. (context zoology English) A thickened glandular portion of the body of the adult earthworm, consisting of several united segments modified for reproductive purposes.